HP XP Racks - Manual (Page 12)

Multipath software
A multipath software package qualified with ESAM is required on each host platform for failover
support. Hitachi's multipath software, Dynamic Link Manager, supports the following host platforms:
•
AIX
•
Linux
•
Solaris
•
Windows. Requires host mode option 57 on the host group where Windows resides.
•
VMware. Requires host mode option 57 on the host group where VMware resides.
Dynamic Link Manager manages I/O through a disk driver.For version information, contact your
HP representative.
Storage system requirements
The requirements for the primary, secondary, and external storage systems must be met to ensure
these systems function properly.
•
Make sure that the primary, secondary, and external storage systems have their own
independent sources of power.
•
The ESAM P-VOL and S-VOL must be located in different storage systems.
•
Primary and secondary storage systems each require two initiator ports and two RCU target
ports.
◦ The initiator port sends ESAM commands to the paired storage system. Initiator ports must
be configured on the primary storage system for ESAM operations. However, for disaster
recovery, you should also configure initiator ports on the secondary storage system.
◦ RCU Target port receives ESAM commands and data. RCU target ports must be configured
on the secondary storage system for ESAM operations. You should also configure RCU
target ports on the secondary storage system for disaster recovery.
Additional microprocessors for replication links may be required based on replication workload.
•
If you use switches, prepare them for both the primary and the secondary storage systems.
Do not share a switch between the two. Using two independent switches provides redundancy
in the event of failure in one.
•
Secondary storage system cache should be configured to support remote copy workloads, as
well as any local workload activity.
•
Cache and non-volatile storage (NVS) must be operable for both the MCU and RCU. If not,
the ESAM Paircreate RAID Manager command will fail.
•
The required program products for ESAM operations must be installed.
Licenses
The following HP software products must be installed on both the primary and secondary storage
systems. Each product each requires a license key.
•
External Storage Access Manager
•
Continuous Access Synchronous
•
External Storage
License capacity
A single ESAM license must be purchased for each P9500 system. The ESAM license is not capacity
based. The capacity of the Continuous Access Synchronous license determines the capacity of
12 System implementation planning and system requirements